Sewing machine



Jan. 26, 1954 COURT 2,667,133

SEWING MACHINE Filed Oct. 9, 1951 2 i H :i 9- 2 i 1 l 1 n 7 I l 1 H13 12 H! 20 1 6 f \u 7 44 e 45 o 21 Q l.

INVENTOR .Iean Courl! ATTORNEY Patented Jan. 26, 1954 SEWING MACHINE Jean'Court, Chatelaine-Geneva, Switzerland, as signer to Melina S. A., Fribourg, Switzerland, a company of Switzerland Application October 9, 1951, Serial No. 250,530

Claims priority, application Switzerland November 6, 1950 6 Claims.

In sewing machines of known construction, it occurs that after assembling the needle is not placed in a correct position relatively to the looptaker. When the machine has a casing forming a single part, it is necessary to deform it in order to correct the position of the needle. In other machines the casing is in two parts: One forming the upper part and the other bottom. In this case the position of the needle is corrected by loosening the bolts or screws which hold together the two parts of the casing. The two parts of the casing are then placed in such a position that the needle is in the correct position relatively to the loop-taker and the bolts, holding together the two parts of the casing are again tightened. Such a method of procedure has various disadvantages. In fact, it is possible that the deformation of the casing or movement of the parts which form it relatively to one another cause Wedging of some of the parts of the control mechanism or of the loop-taker or of the needle.

The present invention has for its object to remedy these disadvantages. It has for its subject a sewing machine, which is distinguished from known sewing machines by the fact that it is provided, in its head, with a device enabling the position of the needle to be adjusted in a transverse plane of the machine.

One form of construction of the machine according to the invention is shown by way of example in the accompanying drawings, wherein:

Fig. 1 is a front view of the head of this machine.

Fig. 2 1, and

Fig. 3 is a section on the line IIIIII of Fig. l.

The sewing machine shown in the drawings is a machine for straight sewing, capable of being converted into a machine for zig-zag sewing.

This machine is provided with a needle bar l which slides in a support 2 held in position by a substantially vertical spindle 3. The spindle 3 is secured at its lower end to a sector member 4 having a bore 5 through which passes with clearance a locking screw 6 screwing into the easing '1 of the machine. The upper end of the spindle 3 is capable of sliding in a pivotal member 3 which itself is pivotally mounted on a horizontal spindle 9 located in the longitudinal direction of the machine. A screw it passing through a lug I! of the support 2 and screwing into a screw-threaded bore l2 to the casing I, and a coiled spring l3 threaded on the shank of the screw maintain the support 2 in the mean position when the machine is adapted for straight is a section on the line II- II of Fig.

iii)

(ill. 112158) 2 sewing, The screw H) is locked by a lock nut HZ located in the same bore [2.

An eccentric mechanism is also provided to enable the sector member to move in the transverse plane of the machine parallel to the direction of the feed movements of the feed dog. This mechanism comprises a part formed by two trunnions l5 and I 6 arranged end to end and cocentrically relatively to one another (see Fig. 3).

The trunnion i5 is capable of pivoting in a bore ll of the casing of the machine and the trunnion IS in a bore 18 of the sector member A.

Thus when it is desired to adjust the position of the needle IQ of the machine in a vertical plane parallel to the direction of the feed movements the reed-dog, the locking screw 6 is unscrewed and the eccentric mechanism I5, !5 is turned through a predetermined angle either in one direction or the other. This rotation produces a transverse movement of the sector memher 4 which entrains in its movement the spindle 3, the support 2 and the needle bar I.

This transverse movement is composed of a rotation of various parts indicated about the horizontal spindle and also a radial movement of these parts either in the direction for moving the separate parts away from or towards the pivotal axis 9. The latter movement is due to the fact that the trunnions l5 and it of the eccentric mechanism each pivot in a bore H and it respectively and that thus the whole of the rotation of the trunnions through a predetermined angle necessarily produces a. movement of the sector member 4 both in the horizontal and in the vertical direction. The movement of the sector member 4 in the vertical direction is made possible by the sliding of the spindle 3 in the interior of the pivotal member 3.

When it is desired to convert to a sewing machine capable of performing zig-zag sewing,

the screw 40 is unfastened from the casing i and the screw I 0 and spring H are removed. The support 2 is then free to oscillate about the vertical spindle 3 as its aixs. A mechanism, not shown, may then be mounted on the machine to efiect oscillatory movements of the support 2.

In the form of construction shown, the rod 20 carrying the pressure foot 2| is secured to the sector member 4. Thus the rod 20 carrying the pressure foot 2| always moves parallel to the needle bar I. However, as the movements to which the needle is subjected are very small, it is possible to conceive a modification in a sewing machine in which the rod 20 carrying the pressure foot is not movable transversely to the mais not convertible into a machine permitting of zig-zag sewing. It is sufficient in fact for the part in which the needle bar slides to be movable transversely relatively to the casing of the machine, for example in guides.

In a modification of the form of construction shown, the eccentric mechanism may be replaced by a screw mechanism of the micrometer screw type.

Further, if it is desired that the adjustment of the needle in a transverse plane of the machine is to take place by moving it parallel to itself, it is sufficient to replace the pivotal member 8 mounted pivotally on the horizontal spindle 9 by a sector member of the type of the part, 4 also held by a locking screw on the casing I and capable of being moved laterally by means of an eccentric mechanism, for example.

I claim:

1. In a sewing machine having a casing, a pivotal member mounted on said casing for movement about a horizontal axis extending in the longitudinal direction of the sewing machine, a vertical spindle having its upper portion slidably mounted in said pivotal member, a sector member in engagement with the lower portion of said vertical spindle, a support journalled on said vertical spindle, a needle bar mounted. for sliding movement on said support, and means mounted on said casing and in engagement with said sector member for causing movement of said sector member transversely to the sewing machine.

2. In a sewing machine having a casing, a pivotal member mounted on said casing for rotation about a horizontal axis, said pivotal member having a bore therein, a vertical spindle, said vertical spindle having a portion slidably recessed in the bore of said pivotal member, a support journalled on said vertical spindle, a needle bar mounted on said support for slidable movement relative thereto, a sector member having a bore therein, the lower portion of said vertical spindle being recessed in said bore of said sector member, and a locking screw securing said sector member to said casing.

3. In a sewing machine having a casing, a pivotal member mounted on said casing for rotation about a, horizontal axis extending in the, longitudinal direction of the machine, a vertical spindle having an upper portion slidably mounted in said pivotal member, a support member journalled on said vertical spindle, a needle, bar mounted for sliding movement on said support member, a sector member engaged with a lower portion of said vertical spindle, a trunnion journalled in said casing, an eccentric trunnion secured to said trunnion, and said sector member being in engagement with said eccentric trunnion whereby, by movement of said trunnion, the position of a needle carried by said needle bar may be adjusted in a plane transverse to the machine.

4. In a sewing machine having a casing, a horizontal spindle projecting from one end of said casing, said horizontal spindle having its axis extending in the longitudinal direction of the sewing machine, a pivotal member mounted on said horizontal spindle, said pivotal member having a bore therein, a vertical spindle, said vertical spindle having a portion slidably recessed in the bore of said pivotal member, a support member journalled on said vertical spindle, a needle bar mounted for sliding movement on said support member, a sector member having a bore therein, a lower portion of said vertical spindle being recessed within the bore of said sector member, and eccentric means mounted on said casing and in engagement with said sector member, whereby the position of a needle carried by said needle bar may be adjusted in a plane transverse to said machine.

5. In a sewing machine having a casing, a first means for enabling a needle mounted in said first means to be adjustably positioned in a plane transverse to the machine, said first means being movably mounted on said casing and comprising a vertical spindle having an axis movably transversely relative to said casing, a support journalled on said vertical spindle, and a needle bar slidably retained in said support, and a second means for moving said first means transversely relative to said casing, said second means being mounted in said casing and engaging said first means transversely to the axis of said vertical spindle.

6. In a sewing machine having a casing, a first means for enabling a needle mounted in said first means to be adjustably positioned in a plane transverse-tothe machine, said first means being movably mounted on said casing and rotatable about a horizontal axis extending longitudinally of the machine, said first means including a vertical spindle having an axis, a support journalled on said vertical spindle, and a needle bar mounted on said support for sliding movement, and a second means for moving said first means transversely of the machine, said second means being mounted in said casing and engaging said first means transversely to the axis of said vertical spindle.

JEAN COURT.

References Cited in the file of this patent UNITED STATES PATENTS Number 

